Ever since the successful development and launch of Windows 7, Microsoft has become ever tighter-lipped about Windows development. Sure, it dropped the bomb about releasing Windows 8 for ARM, but that's it. Nothing on features or timetables (other than 'three years after Windows 7'). Well, the usually well-connected (inside Microsoft, that is) Mary-Jo Foley now claims to have a legit development roadmap - and it seems everything is on track for a Windows 8 beta in September 2011.